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(MbdeL) 2 Sheets-Sheet 1.

H. A. ISBHRG. CHAIR. y No. 283,111. Patented Aug. 14, 1883.

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2 Sheets-Sheet 2.

(ModeL) H. A. ISBERG.

CHAIR.

Patented Aug. 14, 1883.

Hill

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. To all whom it may concern:

K h UNITED STATES PATENT. OFFICE.

CHAIR.

SPECIFICATION forming part Of Letters Patent NO; 283,111, datedAugust14, 1883.

' Application filed August 3, 1882. (ModeL) Be it known that I, HI A.ISBERG, a citizen of the United States, residing at Long Island City, inthe county of Queens and State of New York, have invented certain newand useful Improvements in Chairs; and I do hereby declare thefollowingto be a full, clear, and exact description ofthe invention,such as will enable others skilled in the art to which it appertains tomake and use the same.

This invention has relation to improvements in tilting and revolvingchairs, together desire of the occupant.

with certain improvements in, adjustable footrests; and the objects areto construct a substantial and durable chair of the class named,

which is simple in construction, and which.

may be readily, adjusted in height and tension, and which also may havethe foot-rest correspondingly adjusted in height, and at the same timemay be extended or retracted to suit th My invention consists in thenovel organiza tion and combination of parts, as will be here inaftermorefully set forth.

In the annexed drawings, forming a part of this specification, Figure 1is a perspective view of my improved chair, showing some of the partspartially adjusted. Fig. 2 is a side view thereof,- showing therelativearrangement of ,the parts. Fig. 3 is -a back view, showingthearrangement of the wedges. Fig. 4 is a sectional view without thetextile material. Fig. 5 is avertical sectional view of the metallictube and elevating-screw, showing the vertical spring with; sleeve andstand ard; and Fig. 6 is a sectional view of the adjustable foot-rest. jA j The letter A is the chair-frame, constructed of substantialmaterial, having suitably and securely affixed on the lower side railsorrungs the cross-sill a, provided with a centrally-locatedscrew-threadedhole to receive the elevating-screw of the chair, and alsohaving similarly fixed on the top rails the board I),providedwithacentrally-locatedhole,through which the tube of thestandardpasses, "and 50 piece is centrally secured the metallic plate 0.

This plate 0 is formed with depending side lugs provided withperforations to receive pivot-pins b, and has side walls, d,transversely arranged to the lugs, the space between the lugs and sidewalls being sufficient to admit theupper end of the metallic tube,hereinafter described. In the centerof this metallic pivot-holes at theupper end to receive the pivots passing through the side ears of themetallic plate, by which means the tube is secured to the plate and thechair-seat is allowed to tilt and rock. The lower end of this metallictube fits over the upper end of the supportingscrew, and is fixedthereto by any suitable fastening means.

' The letter F is the supporting or elevating screw, the upper end ofwhich fits in the metallic tube E, and therein secured, as heretoforestated. This screw is bored out to admit the metallic sleeve and rodhereinafter described, and is provided at the lower endwith a.metallic'cap, f, secured by any suitable fastening means. As heretoforestated, the metallic tube E and elevating-screw Fbeing united, the tubepasses through the hole in'the lower cross-piece.

The letter G is the metallic sleeve, formed with a socket :correspondingto the size of the lower part of the vertical spring D, and pro videdwith a screw-threaded hole in the lower end, which extends a suitabledistance upward, for the purpose hereinafter set forth.

The letter H isa metallic rod,"fitting loosely in the core of theelevatingscrew, provided .with screw-threads on the upper portion, 9,which engages with the screw-threaded hole in the metallic sleeve, andat h is cut or otherwise formed an annulus-groove.

At t are'twosemicircular plates, fitting in the cap on the end of thescrew, and each having a central half-circular notch cut therein, sothat when thetwo are brought together they will clasp the metallic rodabout the an nulus and hold it from vertical displacement, but admit ofits being revolved. These semicircular plates are set about the annulusgroove, and then the cap f is secured in place, I The letter 1? is ashaft, journaled by any which holds the plates and rod in properposition. 1

The letter I represents binding wedges adapted to fit in the spacebetween the side ears of the metallic tube, and actuated to suit anoccasion by the handles a, which, are formed with ratehet-teeth engagingwith a cross-plate inthe loop b, and are retained in any one place bymeans of springs fixed to the. plate of the loop I), and press thehandle down on the cross-plate. To the other end of the wedges isattacheda spiral spring, the one end of which is fixed to the crosspieceunder the chair-seat, the purpose of which is that when the handles arefreed from contact with the stop they will pull the wedges back. Thesewedges hold the seat in whatever position desired, or, when loosened,leave the seat free for swinging. I

The letter 1 represents two upright standards, slotted vertically, andsecured by any suitable fastening means to the inside faces of the lowerside rails or rungs of the chair.

The letter K represents lazy-tongs, the inner levers of which arepivotally secured together by means of the rod 2' and then arrangedbetween the uprights and secured there by cap-headedscrews or bolts, soas to slide up and down in the slots of the uprights. The outer lowerends of the levers of the lazytong's are pivotally attached to the lowerends of the standards of the footrest, and have arranged between themand the standards rollers to facilitate the extension and retraction,and the upper outer ends of the levers of the lazy-tongs are providedwith studs fitting and operating in vertical slots in the standards ofthe foot-rest.

The letter L is the foot-rest, consisting of the sections M and M. Thestandards of the lower section, M, are formed with a central tongue, m,on their outer faces, and have a groove, at, out or formedin the innersurfaces, and provided with the plates 19, having vertical slots 1",fitting over the grooves, and in which, by means of studs or pivots, theupper outer ends of the levers of the lazy-tongs are secured and movevertically. The upper section, M, of the foot-rest is made to fit overthe lower section, and has the depending pieces 8, formed with groovesin the inner sides, fitting the tongues on the standards of the lowersection, and is also provided with a series of notches, t, in the innerfaces of the depending pieces s, in which the pawls engage, and secureand retain the sliding section M at any desired elevation.

The letter Nis a pair of levers pivotally at tached to the cross-pieceof the lower section of the foot-rest, theouter ends beingattached tothe upper ends of the pawl u, arranged in slots in the uprights, andwhich engage with the ratchets out in the standards of the slidingfoot-rest. The arms of the levers N may reach together and be looselyriveted in the middle.

suitable means .to the under side of the side rails of the chair-frame,and provided at one end with an arm, 1), fixed rigidly on the shaft, andhaving a stop-pin, w, therein, which engages with perforations in acircular disk, 00, secured to the journal-standard, whereby the shaftmay be stopped from turning, as desired.

The letter R is a piece of suitable textile material, having one endtacked or otherwise fastened to the cross-piece of the sliding sectionof the foot-rest, and the other end secured to or about the shaft P.

The letter S represents segmental racks loosely arranged on pins in theinner side of opposite levers in the lazy-tongs, with the racks engaginganother pin, and formed with a sleeve provided with a link.

The letter T represents a metallic yoke, the arms of which are providedwith notches on their inner sides, and fit in the sleeves of thesegmental racks S, where they are held, and may be adjusted to anydesired height by means of the links engaging with the notches in thearms. This bow or yoke is used as extra support to the textile materialextending from the shaft under the chair to the foot-rest.

The letter U is the book-support, consisting of the attaching means 1,secured to the chair, the standard 2, and the rest 8. The attachingmeans consists of a plate, 4, secured to the chair-seat, and having aportion struck down and provided with a central perforation, and a pin,5. To this struck-down part is pivotally attached the sleeve 6, toreceive the post of the book-rest, and to this part 6 is hinged theperforated disk 7, the holes of which engage with the pin of thesupporting-plate. In the sleeve 6 is loosely suspended the link 8, whichengages with the racks in the post, and by which means the post isretained at any height desired. On the side of the book-rest thebook-rest, and the other arm reaches over the top of the rest, and isprovided with crosspiece which sits over the book and holds it inposition.

It will be observed that instead of the single vertical spring there maybe employed or used a double or triple spring, according to the strainto which thechair is to be subjected; also that the sleeve in which thevertical spring is held should be large enough to admit of the freemotion of the spring, it being readily seen that the action of thespring is not affected by being free in the sleeve. By means of thescrew-connection of metallic sleeve and rod in the supporting-screw thesleeve may be elevated or drawn back, thus regulating the tension of thespring .of the chair.

The pawls for stopping and retaining the adjustable foot-rest should beformed and hung so as not to prevent or hinder the rest from elevation,but so as to readily engage the notches in the standards and secure itagainst retraction by pressure. Inpractical use it is preferable to makethe slots in the plates holding the inner ends of the lazy-tongsinclined backward, and at the bottom of the slots there may be acircular enlargement, the object being toprevent the foot-rest fromtipping up when in use.

I'reserve the right to vary the construction of the chair-frame and itsadjuncts without departing from the spirit of the invention.

What I claimas my invention, and desireto secure by Letters Patent, is

1. In a chair with a supporting-base, a me tallic tube pivotallyattachedto the bottom of the chair, in combination with an elevating-screw, anadjustable metallic sleeve, and a vertical depending spring rigidlyattached to the bottom of the chairrseat and to the metallic sleeve,said parts being organized sub 'stantially as described' 2. In a chair,a supporting-base, in combination with a'metallic tube provided orformed with side ears or lugs near its upper end, vertical springconnected with the chair-seat and the tube,.a chair-seat hinged to themetallic tube, and provided with guide-loops, and the adjustable wedgesworking in the guide-loops 3 5 of the chair-seat and the side ears ofthe tube, I

substantially as and for the purpose set forth.

3. In a chair, a supporting-base, in combination with a metallic tubeformed or pro- Vided with side lugs and pivotally connected to thebottom of the chair-seat, a chair-seat provided with guide-loops,vertical spring, the ratchet-bars provided with thewedgeportions, as setforth, and springs for retaining the wedges and ratchet-bars in theadjusted 5 positions, substantially as described.

4.. The combination, with a chair-seat and its supporting-base andfootrest, of connections, substantially as described, connecting thefoot-rest to the supporting-base, whereby the foot-rest may-be movedtoward and from the base, and the shaft or roller located under thechair, and textile material attached to said foot-rest and roller, asset forth, and for the purpose stated.

5. The combination, with a chair-seat, its supporting-base andfoot-rest, of the shaft or roller located in bearings in the base, withthe textile material attached to the roller and to foot-rest, lazy-tongsconnecting the foot-rest and the chainbase, and the yoke T, attachedthereto, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

HANS ABR. ISBERG.

WVitnesses: ALEXANDER IWOGEE,

LUKE VVARn.

